Question 1

The turkey usually produces females for several generations. How is this possible?

Accepted Answer

In a turkey, female gametes undergo development without fertilization. This phenomenon is called parthenogenesis.

Question 2

In the whiptail lizards only females are born generation after generation. There are no males. How is this possible?

Accepted Answer

Through asexual reproduction/parthenogenesis.

Question 3

In the given figure of a fruit, label the part which is protective in function and that which is responsible for producing new plants?

Accepted Answer

Pericarp is protective in function and seed is responsible for producing new plants.

Question 4

After a successful in-vitro fertilization, the fertilized egg begins to divide. Where is this egg transferred before it reaches the 8-cell stage and what is this technique named?

Accepted Answer

The egg is transferred to the Fallopian tube/oviduct before reaching 8-celled stage. ZIFT/zygote intrafallopian transfer is the technique named after it.

Question 5

Name the organization which developed the ’Saheli’?

Accepted Answer

Central Drug Research Institute (CDRI), Lucknow.

Question 6

Name the stage at which zona pellucida envelop disintegrates?

Accepted Answer

As the blastocyst is formed, the zona pellucida disintegrates.

Question 7

How does colostrum provide protection against diseases to new born babies?

Accepted Answer

Colostrum provides protection against diseases to new born babies because it is rich in antibodies, IgA.

Question 8

Why do internodal segments of sugarcane fail to propagate vegetatively even when they are in contact with damp soil?

Accepted Answer

The site of origin of plantlets is node which when come in contact with damp soil, produce roots and new plants. New plants do not arise from the internodes or internodal segments of sugarcane.

Question 9

How can pollen grains of wheat and rice which tend to lose viability within 30 minutes of their release be made available months later for breeding programmes?

Accepted Answer

The pollen grains are stored by their proper cryopreservation i.e., storing them at very low temperature in liquid nitrogen (−196oC).

Question 10

Mention two events that are inhibited by the intake of oral contraceptive pills to prevent pregnancy in humans?

Accepted Answer

The oral pills inhibit the secretion of FSH and LH that prevent ovulation. They also prevent implantation and alter the quality of cervical mucus to prevent or retard entry of sperms.

Question 11

Why are non-albuminous (exalbuminous) seeds so called?

Accepted Answer

The seeds in which the endosperm is used up during embryo development are called exalbuminous seeds such as bean, pea and gram. These seeds usually store food materials in cotyledons.

Question 12

Name the part of flower that contributes to fruit formation in strawberry and guava respectively ?

Accepted Answer

In strawberry the fruit is formed from ovary and thalamus while in guava, it is derived from the ovary.

Question 13

A bilobed, dithecous anther has 100 microspore mother cells per microsporangium. How many male gametophytes this anther can produce?

Accepted Answer

There will be total of four microsporangia or pollen sacs in this anther. The anther will have 400 microspore mother cells. As each microspore mother cell forms 4 pollen grains, 400 microspore mother cells will form 1600 pollen grains (male gametophytes).

Question 14

An anther with malfunctioning tapetum often fails to produce viable male gametophytes. Give one reason?

Accepted Answer

Tapetum plays an important role as it provides nourishment to the developing pollen grains or male gametophytes.

Question 15

Mention a characteristic feature and a function of zoospores in some algae?

Accepted Answer

These spores are motile and help both in the dispersal and in production of new organism.

Question 16

Pea flower produce assured seed sets. Give a reason?

Accepted Answer

Pea shows bud pollination, i.e., anthers and stigmas of perfect flowers ripen before opening of buds so that self pollination takes place as a rule.

Question 17

Identify the reproductive structure of the figure shown and name the organism they are being released from?

Accepted Answer

Reproductive structures- Zoospores, Organism- Chlamydomonas.

Question 18

$$	extbf{Why do the pollen grains of ﻿$$Vallisneria$$ have a mucilaginous covering? }$$

Accepted Answer

Pollen grains have a mucilage covering to protect themselves from wetting as Vallisneria is a water pollinated species.

Question 19

Name the organism and the mode of reproduction represented in the diagram given below?

Accepted Answer

The organism is Yeast and the mode of reproduction is budding.

Question 20

Why do corn cobs have long tassels?

Accepted Answer

The corn cobs have long tassels which are actually stigma and style. Their long length helps them to trap pollen grains from air.

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Solutions for Trueman's Biology for NEET by Dr Arvind Goyal Vol 1

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